U2 Surprises at Sean Penn's Haiti Benefit Gala

Who else but the acclaimed actor could gather Julia Roberts, Gwyneth Paltrow, Chris Martin and Emma Thompson for a $6 million dollar fundraiser -- and end it with a performance by the iconic rock band? Let's start with the surprise ending of Sean Penn's charity gala: a three song set by U2 wowed the intimate A-list crowd at the Montage Hotel on Saturday night. The rock band, longtime pals of the actor, haven't played on a stage together in four full years. "It's been a while since we played a ho...